Version 1.4 of Call of Duty 5: World at War will include map pack 1 for free, as well as the following:

3 new Multiplayer maps: Kneedeep, Nightfire, Station!
Nazi Zombies map with more weapons, Perks-a-Cola machines, and electroshock defenses: Verrückt!
Improved spawning logic.
Auto balancing improvements. Players are no longer auto balanced while completing objectives.
Mods: IWD’s can be placed in the usermaps folder.
Mods: Hold Breath / Sprint functions as intended.
Mods: MissingAssets.csv is generated when maps are run with developer set to 1.
Fixed lag caused by shooting at tanks.
All rifle grenades fired during the first 15 seconds of Search & Destroy will be duds.
Players who equip a Bouncing Betty and melee teammates in Hardcore game modes are now credited with a team kill penalty.
Players are now deducted 200 points for team killing the bomb planter/defuser in Hardcore Search & Destroy.
Martyrdom no longer causes direct impact deaths in Hardcore modes.
“Bayonet jumping” has been disabled.